Paul’s letters were all written to previously established churches. If pre-gospel written or oral traditions about Jesus’ life had already been given to those c

Paul’s letters were all written to previously established churches. If pre-gospel written or oral traditions about Jesus’ life had already been given to those churches, Paul had little need to repeat it in the short, practical letters that were written (except in a few cases for the sake of his argument, where he does quote the words of Jesus also written in similar form in the gospels). In general I think none of the epistles in the NT discuss biographical details of Jesus, even those scholars generally agree were written post-70 or not by Paul. They’re pretty short and focused on specific points they want to argue.